This video shows tips on how to use insects to benefit your garden. This will teach you ways to reduce the insect load in gardens without the use of chemicals. Rose aphids can be controlled with lady beetles, for example. Although these techniques have been used for agricultural use, they will work in your home garden. Asian Lady Beetle, tend to stay put. They won't migrate. They will attack Pecan Aphids. Trichograma, a wasp that is effective against larvae and eggs.
You have to be certain that you are releasing insects that can tolerate the climate, where you are releasing them.